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FILE – In this July 6, 2017, file photo, Ali Said, of Somalia, center, waits at a center for refugees with his two sons in San Diego. Said, whose leg was blown off by a grenade, says he feels unbelievably …

Most Econ 101 classes start with an explanation of fixed and marginal cost in the context of factories. The factory is the principal fixed cost — expensive and permanent. Canvas wants to smash this assumption of expensive, inflexible, factories by …